Abstract The objective of this research was to develop an effective and complete green approach for the production of composite films with enhanced antioxidant and antibacterial properties and oxygen barrier properties. This was accomplished by incorporating chitosan (CS) and polypyrrole (PPy) to microfibrillated by coasting method prepare MFC/CS/PPy film. The contact angle was used to evaluate poor water resistance, which increased from 94.1° to 122°. The contact angle of the composite film was further increased to 122° due to the chemical polymerization of pyrrole produces a layer of PPy nanoparticles on the surface of the MFC/CS composite film. The CS and PPy improved the uniformity of the surface and filled the pores, indicating that the channel has been blocked, resulting in significant reduction in oxygen transmission (32.38 cm3 (m−2·day−1). The MFC/CS/PPy film showed bactericidal activity against Escherichia coli (5.43 log CFU mL −1 reduction) The synergistic effect of proton amino (in acidic medium) in CS with the positively charged PPy chain improves the antimicrobial performance of MFC/CS/PPy. The positive charges Ions may attach to the negatively charged bacterial cell wall, thus destroying the cell wall and eventually killing the bacteria. The composite films have good thermal stability. The ability of MFC/CS/PPy composite membrane to inhibit 2,2-diphenyl-1-picrylhydrazyl assay (DPPH) activity increases to 54 %. This property depends on the increased activity of the hydrogen atoms. Considering a series of current properties, MFC/CS/PPy composite film was successfully used in the active packing of fresh cherry tomatoes (10 days), effectively extending shelf life. Therefore, MFC/CS/PPy composite film has the potential to be used as biodegradable packaging materials for fresh fruits.

中文翻译：

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用于活性食品包装的微纤化纤维素/壳聚糖/聚吡咯薄膜的制备

摘要 本研究的目的是开发一种有效且完整的绿色方法来生产具有增强的抗氧化和抗菌性能以及氧气阻隔性能的复合薄膜。这是通过将壳聚糖 (CS) 和聚吡咯 (PPy) 掺入微纤丝化制备 MFC/CS/PPy 薄膜来实现的。接触角用来评价耐水性差，从94.1°增加到122°。由于吡咯的化学聚合在MFC/CS复合膜表面产生了一层PPy纳米颗粒，复合膜的接触角进一步增加到122°。CS和PPy提高了表面的均匀性并填充了孔隙，表明通道已被阻塞，导致氧气传输显着减少（32.38 cm3（m-2·day-1）。MFC/CS/PPy 薄膜显示出对大肠杆菌的杀菌活性（减少 5.43 log CFU mL -1） CS 中质子氨基（在酸性介质中）与带正电荷的 PPy 链的协同作用提高了 MFC/CS/ PPy。带正电荷的离子可能会附着在带负电荷的细菌细胞壁上，从而破坏细胞壁并最终杀死细菌。复合薄膜具有良好的热稳定性。MFC/CS/PPy 复合膜抑制 2,2-二苯基-1-苦基肼测定 (DPPH) 活性的能力提高到 54%。这种特性取决于氢原子活性的增加。综合考虑目前的一系列特性，MFC/CS/PPy复合膜成功应用于新鲜樱桃番茄的主动包装（10天），有效延长了货架期。所以，